Method and system for detecting deterioration of exhaust gas con

Details Method and system for detecting deterioration of exhaust gas con Method and system for detecting deterioration of exhaust gas con

1996-04-15

1998-06-30

Ludlow, Jan

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

422 83, 422 94, 436 37, 436137, 436151, 204406, 204427, 73 2331, G01N 2741

Patent

active

057729654

ABSTRACT:
A system for detecting deterioration of an exhaust gas control catalyst provided in an exhaust gas passage through which a combustion exhaust gas is discharged, including a processing zone communicating with a portion of the passage which is downstream of the catalyst and a pumping cell including an oxygen ion conductive solid electrolyte layer and a pair of electrodes one of which is exposed to the processing zone, wherein the pumping cell pumps oxygen out of the processing zone so as to control oxygen partial pressure in the processing zone which corresponds to a monitor voltage, at a value at which the combustible gas component within the processing zone cannot be burned, and the oxygen concentration in the combustion exhaust gas is obtained based on a pumping current flowing between the pair of electrodes of the pumping cell, whereby the degree of deterioration of the catalyst is determined on the basis of the obtained oxygen concentration.

REFERENCES:
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patent: 4755274 (1988-07-01), Mase et al.
patent: 4776943 (1988-10-01), Kitahara
patent: 5250169 (1993-10-01), Logothetis et al.
patent: 5281313 (1994-01-01), Visser et al.
patent: 5288375 (1994-02-01), Logothetis et al.
patent: 5302275 (1994-04-01), Dietz et al.
patent: 5338431 (1994-08-01), Yorita et al.
Patent Abstracts of Japan -vol. 017, No. 250 (P-1537), May 18, 1993 and JP 04 369471 A (Honda Motor Co Ltd), Dec. 22, 1992.

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